Annual report pursuant to Section 13 and 15(d)

Select Quarterly Data (Details)

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Select Quarterly Data (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Select Quarterly Data [Abstract]                      
Revenues:
Expenses 3,919,047 3,717,575 3,912,782 4,863,981 4,367,233 4,658,555 4,819,940 4,417,708 16,413,385 18,263,436 13,269,229
Loss from Operations (3,919,047) (3,717,575) (3,912,782) (4,863,981) (4,367,233) (4,658,555) (4,819,940) (4,417,708) (16,413,385) (18,263,436) (13,269,229)
Other Income, net 3,393,564 850,579 2,146,958 714,939 1,515,078 632,025 1,585,780 145,997 7,106,040 3,878,880 (5,252,372)
Net Loss per share $ (525,483) $ (2,866,996) $ (1,765,824) $ (4,149,042) $ (2,852,155) $ (4,026,530) $ (3,234,160) $ (4,271,711) $ (9,307,345) $ (14,384,556) $ (18,521,601)
Net Loss per share, basic and diluted $ 0.00 $ (0.01) $ (0.01) $ (0.02) $ (0.02) $ (0.02) $ (0.02) $ (0.02) $ (0.04) $ (0.08) $ (0.11)